Simple gray checkered lines, in light tones.
Source Radosław Rzepecki
Greyscale version of a pattern that came out of playing with the 'light rays' plug-in for Paint.net
Source Firkin
A background pattern with a look of rough fabric.
Source V. Hartikainen
Seamless pattern formed from a tile that can be extracted by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
People seem to enjoy dark patterns, so here is one with some circles.
Source Atle Mo
Remixed from a design seen in 'Burghley. The Life of William Cecil', William Charlton, 1857. The tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i.
Source Firkin
A seamless pattern with wide vertical stripes colored in pale yellow.
Source V. Hartikainen
Bright Multicolored Floral Background by Karen Arnold from PDP.
Source GDJ
A beautiful dark wood pattern, superbly tiled.
Source Omar Alvarado
No, not the band but the pattern. Simple squares in gray tones, of course.
Source Atle Mo
You can never get enough of these tiny pixel patterns with sharp lines.
Source Designova
Did some testing with Repper Pro tonight, and this gray mid-tone pattern came out.
Source Atle Mo
Zero CC tileable seed texture, edited by me to be seamless from a Pixabay image. CC0
Source Sojan Janso
Adapted from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin
From a drawing in 'Real Sailor-Songs', John Ashton, 1891.
Source Firkin
Psychedelic Geometric Background No Black
Source GDJ
Sort of reminds me of those old house wallpapers.
Source Tish
A seamless background drawn in Paint.net and vectorised with Vector Magic. The starting point was a photograph of drinking straws from Pixabay.
Source Firkin
Retro Circles Background 4 No Black
Source GDJ
This makes me wanna shoot some pool! Sweet green pool table pattern.
Source Caveman